A person seeking admittance places a hand in a device that examines it with a video camera and converts the video image to numbers in a computer for comparison with the person's prerecorded hand geometry.

With the desert sun casting a rosy afternoon glow, Guillermo Martinez and his wife meandered hand in hand through the town plaza, pausing to gossip with friends and admire the creche under the bell tower of the 18th-century church.

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